GPS OperationsCGSIC Brief

21 September 09

Lt Daniel Boyd2d Space Operations Squadron This briefing is UNCLASSIFIED

1UNCLASSIFIED

Overview

• Navigation and Timing Performance– Navigation Performance– Time Transfer Performance

• Constellation Status

2UNCLASSIFIED

3UNCLASSIFIED

05/0

1/09

05/0

4/09

05/0

7/09

05/1

0/09

05/1

3/09

05/1

6/09

05/1

9/09

05/2

2/09

05/2

5/09

05/2

8/09

05/3

1/09

06/0

3/09

06/0

6/09

06/0

9/09

06/1

2/09

06/1

5/09

06/1

8/09

06/2

1/09

06/2

4/09

06/2

7/09

06/3

0/09

07/0

3/09

07/0

6/09

07/0

9/09

07/1

2/09

07/1

5/09

07/1

8/09

07/2

1/09

07/2

4/09

07/2

7/09

0.000

0.500

1.000

1.500

2.000

2.500

3.000

GPS Constellation RMS ERD Performance -- 01-May-09 through 28-July-09

Blk IIA Daily RMS Blk IIR Daily RMS Qtrly RMS All Qtrly RMS Blk IIA Qtrly RMS Blk IIR

Date

RM

S E

RD

(M

eter

s)

Report Period: 01-May-09 through 28-July-09 IIA Qtly RMS: 1.04 m IIR Qtly RMS: 0.50 m Const. Qtly RMS: 0.76 m

-10-505

1015

12

5

13

5

14

5

15

5

16

5

17

5

18

5

19

5

20

5

NA

NO

SE

CO

ND

S

JDAY

RMSAvg

UTC TIME TRANSFERSpecification 28ns

4UNCLASSIFIED

SV (PRN)Clock*Wheel

* II/IIA = Rb, Rb, Cs, Cs IIR = Rb, Rb, Rb

Meets Spec

Reduced Capability

Unusable for Ops

Unused

In Use

Clock/Wheel Key

Full Redundancy

Redundancy Lost

Reliability Unknown

Drifting within Plane

Bus/Nav Key

KEY

GPS Space Status – 03 Aug 2009Nav/Bus /Clock/Reaction Wheel Performance Status

A r r g G r g g r r g

g g g g g g g g g g g g g g g g g g g g g g g

LADO

B g g y g g y R R r r r g r

g g g g g g g g g g g g g g g g g g g g g g g

LADO

C g r r r g g g y r R y r g r r

g g g g g g g g g g g g g g g g g g g g g g g g

D g y g g g r r r g

g g g g g g g g g g g g g g g g y r g

E g g r r g r g r g r r

g g g g g g g g g g g g g g g g g g g g

LADO

F g g g g g g y r r g r

g g g g g g g g g g g g g g g g g g g g g g g g

47R (22) 12/03 40A (10) 07/96

57R (29) 12/07 33A (03) 03/96 59R (19) 03/04

61R (02) 11/04 46R (11) 10/99 45R (21) 04/03

55R (15) 10/07 43R (13) 07/97

27A (27) 09/92

Pla

ne

39A (09) 06/93 52R (31) 9/06

51R (20) 05/00

41R (14) 11/00

56R (16) 01/03 49R (01) 04/09

60R (23) 06/04 26A (26) 07/92 32A (XX) 11/92

54R (18) 01/01 23A (32) 11/90

37A (XX) 05/93

30A (30) 09/96

5 6

48R (07) 03/08

34A (04) 10/93 24A (24) 07/91

36A (06) 03/9453R (17) 09/05

Slot

58R (12) 11/06 35A (XX) 08/93

1 2 3 4

38A (08) 11/97 25A (25) 02/92

44R (28) 07/00

00R (00) 00/08

    g  

g g g g

Unhealthy

5

6

21 (+1) SVs past design life (including residual SVs) 18 (+0) Operational SVs past design life 15 (+0) SVs past pre-launch mean life estimate (MLE) (including residual SVs) 12 (+0) Operation SVs past pre-launch mean life estimate (MLE) 19 (+0) SVs one component away from Nav mission failure (including residual

SVs) 16 (+0) Operation SVs one component away from Nav mission failure 8 (+0) SVs one component away from bus failure (including residual SVs) 6 (+0) Operational SVs one component away from bus failure

Constellation Status Summary

Total SVs in Category

Changes Since Last Update

7

IIA Vehicles On Last Clock

• SVN 36: has a higher likelihood of failing due to its Rb clock being turned on with over 8 years of on-orbit storage

• SVN-37: being stored as on-orbit spare in LADO• SVN-32: being stored as on-orbit spare in LADO• SVN-35: being stored as on-orbit spare in LADO

SVN Slot 1st Clock Last Clock

Storage time for current

clock (Years)

Clock operating time (Years)

Operational Clock

Clocks Remaining

Current Age of Vehicle (Years)

23 5-Dec-90 1-Jan-04 13.1 5.7 Rb #2 None 18.824 13-Jul-91 7-Sep-00 9.2 9.0 Cs #4 None 18.225 15-Mar-92 25-Dec-05 13.8 3.7 Rb #1 None 17.527 A4 24-Sep-92 20-May-05 12.7 4.3 Cs #4 None 17.030 B2 27-Sep-96 2-Jun-06 9.7 3.3 Cs #3 None 13.032 5-Dec-92 19-Aug-96 3.7 13.1 Cs #3 None 16.833 C2 3-Apr-96 1-Jan-07 10.8 2.7 Cs#4 None 13.536 18-Mar-94 19-Mar-04 10.0 5.5 Rb #1 None 15.537 20-May-93 21-Aug-07 14.3 2.1 Rb #2 None 16.340 E3 1-Aug-96 25-Mar-08 11.7 1.5 Cs #3 None 13.1

Bottom Line: 11 of 15 IIAs left are on their last clock

8

IIR/IIR(M) Clock Status No IIR/IIR(M) clock failures to date

SVN 43: First IIR launch, AFS 3 on for test

purposes only SVN 44:

AFS 1 had a baseplate heater failure

Clock is assessed as viable Performance could be slightly

degraded during eclipse season

SVN 61: AFS 3 clock failure Switched to AFS 1

SVN Clock Status Date Active Total Years in Use

41 AFS 1 On 15-Nov-00 8.84AFS 1 On 13-Aug-97 12.10AFS 3 Off 7-Jul-98 0.87AFS 1 Off 10-Aug-00 0.06AFS 2 On 14-Aug-00 9.09

45 AFS 3 On 4-Apr-03 6.4546 AFS 1 On 21-Dec-99 9.7447 AFS 3 On 24-Dec-03 5.7348 AFS 3 On 19-Mar-08 1.4949 AFS 2 On 28-Mar-09 0.4751 AFS 1 On 17-May-00 9.3452 AFS 3 On 29-Sep-06 2.9653 AFS 3 On 29-Sep-05 3.9654 AFS 1 On 7-Feb-01 8.6155 AFS 3 On 22-Oct-07 1.9056 AFS 3 On 6-Feb-03 6.6157 AFS 3 On 23-Dec-07 1.7358 AFS 3 On 21-Nov-06 2.8259 AFS 3 On 24-Mar-04 5.4860 AFS 2 On 28-Jun-04 5.22

AFS 1 On 27-Apr-08 1.39AFS 3 Off 10-Nov-04 3.47

43

44

61

9

A CB ED F

80

100

120

160

180

0

20

40

60

GLAN

(deg)

A338

A139

B156

B344

D434

D246

E340

E454

F343

F141

D345

E151

E247

C359

F460

D161

35

27 36

2524

GPS Locations

C453

140

B6

30

A252

58 B423

C233

C157

F255

37

SVN-26 Rephase Complete: Sept ‘09

A448

32

IIF-1

49

Block IIA residual

Empty Slot

Watch List

Block IIA

Block IIR

Block IIR-MBlock IIR-M (L-5)

B5

B2

26

E650

Geographic Longitude of Ascending Node(GLAN)

0

100

120

A CB ED F

60

80

180

140

20

40

160F3 43

26

51

40

54

46

34

35

30

56

44

39

25

38 27

F2

F1

F4

E1

E3

E4

E2

D2

D4

D1

D3

B4

A1 B2

B1

B3

A2

A4

A3

C1

C2C3

45

47

60

6153C4

NOTE: Chart reflects status of bus & navigation payload only (not NDS payload status).

FMC

PMC

NMC

Inactive

Maneuver

OPSCAP

3359

52

Block SVNs ( # )IIA 22-40 (14)IIR/IIR-M 41-61 (18)Current IIR-M’s (48, 52, 53, 55, 57, 58)

5823

24

4132

36

57

55

37

48

Summary

• Navigation and Timing Performance– Navigation Performance– Time Transfer Performance

• Constellation Status

• Questions…

11UNCLASSIFIED